colour

The color (a color) points at the color stimulus that is stimulation to wake up the sense of color that is the sight that a difference of the quality is recognized by a difference of the composition of the visible ray and sense of color.
The color is one of the senses to be provided through sight, and the color is quantity of psychology physics like the size of the sound not mass and quantity of physics such as the volume.
For example, as the example which feels a color though there is not a physical counterpart artificially, there is an optical illusion phenomenon called the top of the Ben ham.
Though I paint it in white and black and distributed the top surface of the top with the top of the Ben ham, it points at the experiment that a color perception is born when I turn it.
The change of the color is explained physically by "affinity" with the light to light up an object and the object.
When the light of some kind of wavelengths to be incident on an object does a reflection (including mirror reflection / the diffused reflection) to the direction of the observer, I accept the (= wavelength that only the specific wavelength that accepted the properties of matter of the object is reflected, and is absorbed other than it and have a phenomenon called) that reflectance is different.
A color judged based on the wavelength is recognized as "a color of the object" so that only reflected light arrives to an observer (in other words light itself does not have the property of the color, and the organ which caught the light makes a color).
In addition, as for the general color, it is that is to say expressed the range of the visible ray as a standard human sight so that it is controlled by light and recognition for it to touch an observer like that.
Paradoxically when I looked in visible light area, I compare it, and there are at all another "color" and the object that it becomes likely when I observe it about the light of the wavelength beyond the range of the visible ray.
For example, the design of the feather of the butterfly draws a bright design different again to watch it by the naked eye of the person in the ultraviolet rays domain, and I am black, and, as for the newspaper which burnt, paper and the ink which burnt by a certain wavelength of the infrared rays domain can read the original contents which it was written so that reflectance is different in the part which burnt.